SUBJECT : PHYSICS - SSA Punjab

5. What are coherent sources? Why two independent source of light do notproduce interference pattern?6. What happens to fringe width under the following operations; (i) slitwidth is reduced (ii) distance between screen and slit is reduced (iii)monochromatic light is replaced by white light (iv) apparatus is immersedin water?7. Define resolving power of telescope. On what factors it depends?8. Define resolving power of microscope. On what factors it depends?9. What is polarization of light? How will you represent polarized andunpolarised light?10. State and prove Brewster law of polarization of light.11. What are Polaroid and give its uses?12. Define (i) critical angle (ii) polarizing angle. What is relation betweenthem?13. What is total internal reflection? Write the conditions for total internalreflection to take place. Give one application of total internal reflection.14. What is optical fibre? State its principle and give its applications.15. What is power of lens? Why is the power of a lens measured as thereciprocal of focal length?16. What is equivalent lens? Obtain an expression for the effective focallength of two convex lenses placed in contact.17. State and prove prism formula.18. Derive the relation for refractive index of material of prism when prism isplaced in minimum deviation position.19. Prove that for small angle of prism δ=A (µ-1).20. What do you understand by deviation without dispersion? Obtainexpression for it.21. An object is placed at a distance of 40cm from a concave mirror of focallength 15cm. if the object is displaced through a distance of 20cmtowards the mirror, by how much distance is the image displaced?22. A convex lens of focal length 0.2 m and made of glass (µ=1.5) isimmersed in water (µ=1.33). Find the change in the focal length of thelens.23. An object is placed at a distance of 75 cm from a screen, where should aconvex lens of focal length 12 cm be placed so as to obtain real image ofthe object on the screen?24. A ray of light incident on an equilateral glass prism shows minimumdeviation of 30°. Calculate the speed of light through glass prism.25. A person’s far point is 2m and his near point is 40 cm. find the nature,focal length and power of the lenses, he must use to (a) see distant objectsand (b) read a book clearly. The least distance of distinct vision is 25 cm.46